brew update

Error: The /usr/local directory is not writable.

Even if this directory was writable when you installed Homebrew, other

software may change permissions on this directory. Some versions of the

"InstantOn" component of Airfoil are known to do this.

You should probably change the ownership and permissions of /usr/local

back to your user account.

sudo chown -R $(whoami):admin /usr/local

If I then do the sudo one I get a warning that this

may lead to severe damage. SO I have no yet done that.

From: firedrake-bounces@imperial.ac.uk <firedrake-bounces@imperial.ac.uk> on behalf of Homolya, Miklós <m.homolya14@imperial.ac.uk>
Sent: Thursday, August 4, 2016 9:23 PM
To: firedrake
Subject: Re: [firedrake] failed update

Dear Onno,

Can you please try these?

$ brew update

$ brew install autoconf

What does the following say?

$ brew doctor

Thanks,

Miklos

From: firedrake-bounces@imperial.ac.uk <firedrake-bounces@imperial.ac.uk> on behalf of Onno Bokhove <O.Bokhove@leeds.ac.uk>
Sent: 04 August 2016 21:17:48
To: firedrake
Subject: [firedrake] failed update

Did:

firedrake-clean
and/or recovering from the broken installation by

cd src/firedrake
git pull
./scripts/firedrake-install --rebuild-script

then

firedrake-update

but get error message:

Error: No such keg: /usr/local/Cellar/autoconf

Error: Cannot write to /usr/local/Cellar

Traceback (most recent call last):

File "/Users/amtob/werk/firedrake/bin/firedrake-update", line 813, in <module>

brew_install("autoconf")

File "/Users/amtob/werk/firedrake/bin/firedrake-update", line 250, in brew_install

check_call(["brew", "install"] + arguments)

File "/Users/amtob/werk/firedrake/bin/firedrake-update", line 228, in check_call

subprocess.check_call(arguments, env=env)

File "/usr/local/Cellar/python/2.7.10_2/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 540, in check_call

raise CalledProcessError(retcode, cmd)

subprocess.CalledProcessError: Command '['brew', 'install', 'autoconf']' returned non-zero exit status 1

on laptop while firedrake worked few weeks ago.